I think that that’s perhaps a little bit of an overreaction to what is just a short little promotional reel that is just meant to be a reminder of “hey this is opening soon.” I don’t know why everyone is asking for them to dive into deep detail about what they did when they rarely ever do that.
The most extensively they covered ride development was TBA and even that was primarily story and music focused.
It just seems like people grasping at essentially nothing so they have some reason to whine about something. If anything this site should be glad the cars aren’t new. Everyone talks about how they don’t think Disney should do new just for the sake of new, and that’s what new ride vehicles would be. There is zero compelling reason why they would need to do anything else other than change the wraps. There is no issue with the ride vehicles and never has been.